Kyosho IF347-126B Multi-Hole Shock Piston (2pcs) for Big Shock Assemblies  [KY-IF347-126B]

What these pistons do

This Kyosho IF347-126B unit is supplied as a pair of RC shock pistons intended for larger shock bodies where multi-hole designs are needed to regulate oil flow. They act as replacement parts or tuning inserts for adjusting suspension damping on model cars.

The two pistons feature multi-hole configurations that influence how the shock oil moves, which affects damping rates and the feel through the suspension stroke. Swapping piston styles or hole counts is a straightforward way to alter bump and rebound characteristics.

To fit, service the shock in the normal way: remove spring and rod, slide the piston onto the shaft in the correct orientation, then reassemble using the recommended seals and oil. Always verify fit inside your shock and check rod alignment to avoid binding or premature seal wear.

For setup, pair the piston selection with appropriate oil viscosity and spring rates: smaller holes or heavier oil give slower damping, while larger holes or lighter oil speed it up. Tweak in small steps and trial on your preferred surface to dial in handling.